Security flaws from time-varying active encoding in high-speed measurement-device-independent quantum key distribution
arxiv(2024)
摘要
Quantum key distribution (QKD) can transmit secret keys with, in principle,
information-theoretic security. However, bandwidth limitations in practical
equipment threaten the security of high-speed (GHz) QKD systems. We propose and
characterize a new side channel which arises when using active encoding. As an
illustrative example, we focus on electro-optic phase modulation for
polarization encoding at 1 GHz. We show that this side channel may reduce the
maximum secure transmission distance by over 50
measurement-device-independent QKD protocol.
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